<form method="post" enctype="multipart/form-data">
    账号：<input type="text" name="account"/>
    <br/>
    密码：<input type="text" name="password"/>
    <br/>
    密码2：<input type="text" name="passwordAgain"/>
    <br/>
    验证码：<img id="Captcha" src="{{ path("getCaptchaImg") }}" alt="验证码" onclick="document.getElementById('Captcha').src='{{ path("getCaptchaImg") }}?'+Math.random()"/>
    <br/>
    验证码：<input type="text" name="captcha"/>
    <br/>
    <input type="submit" />
</form>